Catholic Radicalism: Phrased Essays For The Green Revolution, by Peter Maurin. Published by Catholic Worker Books, introduction by Dorothy Day and foreword by David Mason. First edition of August 1949.
Public domain: "The contents of this book are not copyrighted. The text may be reproduced by anyone in any desired form. May it be done for the greater honor and glory of God and the furtherance of the lay apostolate to which the author's life was devoted."